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| 1 // Copyright 2013 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "base/files/memory_mapped_file.h" | |
| 6 | |
| 7 #include "base/files/file_path.h" | |
| 8 #include "base/strings/string16.h" | |
| 9 #include "base/threading/thread_restrictions.h" | |
| 10 | |
| 11 namespace base { | |
| 12 | |
| 13 MemoryMappedFile::MemoryMappedFile() : data_(NULL), length_(0), image_(false) { | |
| 14 } | |
| 15 | |
| 16 bool MemoryMappedFile::InitializeAsImageSection(const FilePath& file_name) { | |
| 17 image_ = true; | |
| 18 return Initialize(file_name); | |
| 19 } | |
| 20 | |
| 21 bool MemoryMappedFile::MapFileRegionToMemory( | |
| 22 const MemoryMappedFile::Region& region) { | |
| 23 ThreadRestrictions::AssertIOAllowed(); | |
| 24 | |
| 25 if (!file_.IsValid()) | |
| 26 return false; | |
| 27 | |
| 28 int flags = image_ ? SEC_IMAGE | PAGE_READONLY : PAGE_READONLY; | |
| 29 | |
| 30 file_mapping_.Set(::CreateFileMapping(file_.GetPlatformFile(), NULL, | |
| 31 flags, 0, 0, NULL)); | |
| 32 if (!file_mapping_.IsValid()) | |
| 33 return false; | |
| 34 | |
| 35 LARGE_INTEGER map_start = {0}; | |
| 36 SIZE_T map_size = 0; | |
| 37 int32 data_offset = 0; | |
| 38 | |
| 39 if (region == MemoryMappedFile::Region::kWholeFile) { | |
| 40 int64 file_len = file_.GetLength(); | |
| 41 if (file_len <= 0 || file_len > kint32max) | |
| 42 return false; | |
| 43 length_ = static_cast<size_t>(file_len); | |
| 44 } else { | |
| 45 // The region can be arbitrarily aligned. MapViewOfFile, instead, requires | |
| 46 // that the start address is aligned to the VM granularity (which is | |
| 47 // typically larger than a page size, for instance 32k). | |
| 48 // Also, conversely to POSIX's mmap, the |map_size| doesn't have to be | |
| 49 // aligned and must be less than or equal the mapped file size. | |
| 50 // We map here the outer region [|aligned_start|, |aligned_start+size|] | |
| 51 // which contains |region| and then add up the |data_offset| displacement. | |
| 52 int64 aligned_start = 0; | |
| 53 int64 ignored = 0; | |
| 54 CalculateVMAlignedBoundaries( | |
| 55 region.offset, region.size, &aligned_start, &ignored, &data_offset); | |
| 56 int64 size = region.size + data_offset; | |
| 57 | |
| 58 // Ensure that the casts below in the MapViewOfFile call are sane. | |
| 59 if (aligned_start < 0 || size < 0 || | |
| 60 static_cast<uint64>(size) > std::numeric_limits<SIZE_T>::max()) { | |
| 61 DLOG(ERROR) << "Region bounds are not valid for MapViewOfFile"; | |
| 62 return false; | |
| 63 } | |
| 64 map_start.QuadPart = aligned_start; | |
| 65 map_size = static_cast<SIZE_T>(size); | |
| 66 length_ = static_cast<size_t>(region.size); | |
| 67 } | |
| 68 | |
| 69 data_ = static_cast<uint8*>(::MapViewOfFile(file_mapping_.Get(), | |
| 70 FILE_MAP_READ, | |
| 71 map_start.HighPart, | |
| 72 map_start.LowPart, | |
| 73 map_size)); | |
| 74 if (data_ == NULL) | |
| 75 return false; | |
| 76 data_ += data_offset; | |
| 77 return true; | |
| 78 } | |
| 79 | |
| 80 void MemoryMappedFile::CloseHandles() { | |
| 81 if (data_) | |
| 82 ::UnmapViewOfFile(data_); | |
| 83 if (file_mapping_.IsValid()) | |
| 84 file_mapping_.Close(); | |
| 85 if (file_.IsValid()) | |
| 86 file_.Close(); | |
| 87 | |
| 88 data_ = NULL; | |
| 89 length_ = 0; | |
| 90 } | |
| 91 | |
| 92 } // namespace base | |
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Chromium Code Reviews
Issue 1446363003:
Deleted OS_WIN and all Windows specific files from base. (Closed)
Base URL: https://github.com/domokit/mojo.git@base_tests